<script>
import {mapState} from 'vuex'
import throttle from 'lodash/throttle'
export default({
  name: "TypeNav",
  data(){
      return {
        currentIndex:-1,
        show:true
      }
  },
  mounted() {
    if(!this.$route.path.startsWith('/home')){
      this.show=false
    }
  },
  computed:{
      ...mapState({
        categoryList:(state)=>{
          return state.home.categoryList
        }
      })
  },
  methods:{
    changeIndex:throttle(function (index){
      this.currentIndex = index
    }, 50),
    goSearch(event) {
      let {categoryname,category1id,category2id} = event.target.dataset
      console.log(categoryname)
      if(categoryname){
        // 说明是a标签
        // 进行路由的跳转
        const location = {name:'Search'}
        const query = {categoryName:categoryname}
        if(category1id){
          query.category1Id = category1id
        }else if(category2id){
          query.category2Id = category2id
        }
        location.query = query;
        console.log(location)
        if(this.$route.params){
          location.param=this.$route.params;
        }
        this.$router.push(location);
      }
    },
    enterShow(){
      this.show = true
    },
    leaveIndex(){
      this.currentIndex=-1
      if(!this.$route.path.startsWith('/home')){
        this.show = false
      }
    }
  }
})
</script>

<template>
  <!-- 商品分类导航 -->
  <div class="type-nav">
    <div class="container">
      <div  @mouseleave="leaveIndex()"  @click="goSearch">
        <h2 class="all" @mouseenter="enterShow">全部商品分类</h2>
        <transition name="fade">
          <div class="sort" v-show="show">
            <div class="all-sort-list2" >
              <div class="item" v-for="(c1, index) in categoryList.categories" :key="index" :class="{cur:currentIndex == index}">
                <h3 @mouseenter="changeIndex(index)">
                  <a :data-categoryName="c1.name" :data-category1Id="c1.id">{{c1.name}}</a>
                </h3>
                <div class="item-list clearfix" :style="{display:currentIndex == index?'block':'none'}">
                  <div class="subitem"  v-for="(c2, index) in c1.subCategories" :key="index">
                    <dl class="fore">
                      <dt>
                        <a :data-categoryName="c2.name" :data-category2Id="c2.id">{{c2.name}}</a>
                      </dt>
                      <dd>
                        <em v-for="(c3, index) in c2.thirdNames" :key="index">
                          <a :data-categoryName="c3">{{c3}}</a>
                        </em>
                      </dd>
                    </dl>
                  </div>
                </div>
              </div>

            </div>
          </div>
        </transition>

      </div>

      <nav class="nav">
        <a href="###" v-for="(top,index) in categoryList.topNav" :key="index">{{top}}</a>
      </nav>

    </div>
  </div>
</template>

<style scoped lang="less">
.type-nav {
  border-bottom: 2px solid #e1251b;

  .container {
    width: 1200px;
    margin: 0 auto;
    display: flex;
    position: relative;

    .all {
      width: 210px;
      height: 45px;
      background-color: #e1251b;
      line-height: 45px;
      text-align: center;
      color: #fff;
      font-size: 14px;
      font-weight: bold;
    }

    .nav {
      a {
        height: 45px;
        margin: 0 22px;
        line-height: 45px;
        font-size: 16px;
        color: #333;
      }
    }

    .sort {
      position: absolute;
      left: 0;
      top: 45px;
      width: 210px;
      height: 461px;
      position: absolute;
      background: #fafafa;
      z-index: 999;

      .all-sort-list2 {
        .item {
          h3 {
            line-height: 30px;
            font-size: 14px;
            font-weight: 400;
            overflow: hidden;
            padding: 0 20px;
            margin: 0;

            a {
              color: #333;
            }
          }

          .item-list {
            display: none;
            position: absolute;
            width: 734px;
            min-height: 460px;
            background: #f7f7f7;
            left: 210px;
            border: 1px solid #ddd;
            top: 0;
            z-index: 9999 !important;

            .subitem {
              float: left;
              width: 650px;
              padding: 0 4px 0 8px;

              dl {
                border-top: 1px solid #eee;
                padding: 6px 0;
                overflow: hidden;
                zoom: 1;

                &.fore {
                  border-top: 0;
                }

                dt {
                  float: left;
                  width: 54px;
                  line-height: 22px;
                  text-align: right;
                  padding: 3px 6px 0 0;
                  font-weight: 700;
                }

                dd {
                  float: left;
                  width: 415px;
                  padding: 3px 0 0;
                  overflow: hidden;

                  em {
                    float: left;
                    height: 14px;
                    line-height: 14px;
                    padding: 0 8px;
                    margin-top: 5px;
                    border-left: 1px solid #ccc;
                  }
                }
              }
            }
          }

          //&:hover {
          //  .item-list {
          //    display: block;
          //  }
          //}
        }

        .cur{
          background-color: skyblue;
        }
      }
    }

    /* 过渡效果 */
    .fade-enter-active, .fade-leave-active {
      transition: opacity 0.3s, transform 0.3s;
    }

    .fade-enter, .fade-leave-to {
      opacity: 0;
      transform: translateY(20px);
    }
  }
}
</style>